4 min readUpdated September 2026
Data API & Developer Tools
Programmatic email verification, deliverability audits, lead discovery, and campaign automation via REST API.
Key Feature Highlights
- Secure Bearer API Key authentication with SHA-256 hashed storage
- Email deliverability verification (syntax, MX, SMTP handshake, disposable detection)
- Domain DNS health audits (SPF, DKIM, DMARC, MX, and blacklist reputation)
- Prospect lead search and discovery by job title, industry, and location
- OpenAPI 3.1 schema ready for ChatGPT Custom Actions and Postman
Authentication
All API requests require your Shakehand API key passed via the Authorization header. Generate your key in Settings > API & MCP.
BASH
curl -H "Authorization: Bearer shk_live_YOUR_KEY" https://shakehand.cloud/api/v1/pingCore Endpoints
The following REST endpoints are available under /api/v1:
| Method | Endpoint | Description |
|---|---|---|
| GET | /api/v1/ping | Verify API key connection and workspace user |
| POST | /api/v1/verify | Verify email deliverability (single or batch) |
| POST | /api/v1/sender-health | Audit domain SPF, DKIM, DMARC, and MX records |
| POST | /api/v1/leads/discover | Discover verified B2B decision-maker leads |
| GET | /api/v1/campaigns | List campaigns with live sent, open, and reply rates |
| POST | /api/v1/campaigns | Create a new sequence campaign |
| GET | /api/v1/contacts | Search and filter saved contacts and leads |
| POST | /api/v1/contacts | Add or ingest new leads with custom fields |
| GET | /api/v1/inbox | Retrieve master inbox replies and unread threads |
| POST | /api/v1/inbox/reply | Send replies through connected mailboxes |
| GET | /api/v1/analytics | Workspace conversion funnel and capacity metrics |
| GET | /api/openapi.json | OpenAPI 3.1 specification for ChatGPT Actions |